How to Design Active RC Filter

[krishnaraoseelam]

I need to Design an Active RC filter. for that i need opamp but iam not able to design my opamp as stable iam not getting pahase margin correctly does it show any effect in filter design..

 

[john blue]

**broken link removed**

 

[Borber]

Phase margin of used opamp has essential influence on active filter design. Theoretically opamp phase must be flat. Practically the opamp unity gain frequency must be few decades higher than max filter operating frequency.